I know people who graduated in CS with one of those old IBM X220s, but for the sake of modernity, there are a lot of options, the T and P series have good releases, but one model can have different specs. I have the T480s and if you can find a used T470 or T480 (s or without s), it will serve you well. Some of these will also allow you to upgrade the RAM and SSD. It might be a tad slow if you do all those things you mentioned at once, but I can open 4 or 5 PDFs, 30+ tabs and a few terminals and it's still quite responsive.
Some guides on different models (I don't know how useful these are, but they might help you):